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Identification of Clostridium Perfringens Enterotoxin As a Novel Candidate Trigger for Sudden Infant Death Syndrome Author(S): Vincent Fischetti, Ph.D

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Identification of Clostridium Perfringens Enterotoxin As a Novel Candidate Trigger for Sudden Infant Death Syndrome Author(S): Vincent Fischetti, Ph.D The author(s) shown below used Federal funding provided by the U.S. Department of Justice to prepare the following resource: Document Title: Identification of Clostridium Perfringens Enterotoxin As A Novel Candidate Trigger for Sudden Infant Death Syndrome Author(s): Vincent Fischetti, Ph.D. Document Number: 300828 Date Received: May 2021 Award Number: 2016-DN-BX-0176 This resource has not been published by the U.S. Department of Justice. This resource is being made publically available through the Office of Justice Programs’ National Criminal Justice Reference Service. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Title Page Funding opportunity number: NIJ-2016-4305 “Research and Development in Forensic Science For Criminal Justice Purposes” Identification of Clostridium perfringens enterotoxin as a novel candidate trigger for Sudden Infant Death Syndrome Start date: July 1st 2017 End date: June 30th 2020 Contact information of principal investigator: Vincent Fischetti, PhD (New Investigator) Professor and Head of the Laboratory of Bacterial Pathogenesis The Rockefeller University 1230 York Avenue New York, NY, 10065 Tel: 212-3 27-8166 Fax: 212-327-7584 Cell: 516- 901-8400 Email: [email protected] Contact information of applicant organization: Collette Ryder, MBA Director, Sponsored Research and Program Development The Rockefeller Un iversity 1230 York Avenue, Box 82 New York, NY, 10065-6399 Tel: 212 327 8054 Email: [email protected] Key words: Medicolegal death investigations, forensic pathology, forensic toxicology, sudden infant death syndrome, microbiome 1 This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. SUMMARY OF STUDY FINDINGS Under the auspices of the NIJ/DOJ, we have explored the hypothesis that sudden infant death syndrome (SIDS), may be triggered by environmental exposure to Clostridium perfringens enterotoxin (CPE). In this report, we show that the infant brainstem respiratory center is indeed susceptible to damage by bloodborne CPE dissemination, thus recapitulating the inflammatory scarring that has been observed in brain samples harvested from SIDS victims. In addition to brainstem expression of the CPE receptors, claudin 3 and claudin 4, we have also discovered brainstem expression of the rotavirus receptor, Junctional Adhesion Molecule 1 (JAM1), potentially implicating rotavirus infection as an alternate or coincident SIDS trigger. We have also characterized intestinal carriage of the C. perfringens bacterium and determined the prevalence of CPE gene carriage in fecal samples harvested from infants who have died suddenly; victims of sudden unexpected infant death (SUID). Of the 74 SUID fecal specimens collected, 26 samples (35%) were determined to be positive for C. perfringens. Furthermore, 16 of the 26 cultured C. perfringens strains (62%) carried the CPE gene. As commensal C. perfringens strains typically carry the CPE gene at a frequency of less than 15%, this four-fold CPE gene enrichment in SUID cases (p = 0.0014) strongly implicates CPE-producing C. pefringens strains in the pathogenesis of s udden infant death syndrome. INTRODUCTION Sudden Infant Death Syndrome (SIDS) is the leading cause of death in children less than one year of age (0.8/1000 live births).1 Surely, the impact of SIDS on parents and families is tragic. However, the root cause of this disease remains unknown. Our current understanding of SIDS involves unexplained abnormalities in the respiratory center of the medulla oblongata (a portion of the brainstem); the thought being that SIDS victims have insufficient respiratory drive to adequately respond to episodes of apnea, where breathing ceases. The Ventral Medullary Surface (VMS) of the medulla oblongata, which controls respiratory drive, has come under investigation within the last few decades as neuropathologists have identified evidence of injury (astrogliosis) and neuronal loss within the arcuate nucleus of the VMS.1,2,3 The neurons that comprise the arcuate nucleus/VMS express chemoreceptors that sense increasing levels of carbon dioxide in the blood, and activation of these neurons triggers the respiratory drive. The current theory is that selective neuronal loss and/or reduced neurotransmitter binding within the arcuate nucleus/VMS makes SIDS victims uniquely susceptible to accidental asphyxiation during periods of sleep.1,2,3 Along these lines, having babies sleep in the supine position as opposed to the prone position has reduced the incidence of SIDS by thirty-eight percent.3 Although a promising lead in SIDS research, how this region of the brain incurs damage still eludes us. Bacterial toxins have also drawn attention in the pathogenesis of SIDS .4-6 One toxin in particular, Clostridium perfringens enterotoxin, has been previously implicated.7,8,9 Interestingly, investigators have found that C. perfringens can be identified in the intestinal tracts of up to 81% of SIDS infants compared to just 20% of healthy controls. Furthermore, damage to intestinal epithelium has been identified in 84% of SIDS cases and can be recapitulated in an animal model by exposing both mouse and rabbit intestine to enterotoxin.8,9 Scanning electron microscopic comparison of the intestinal damage present in SIDS and experimental enterotoxin-mediated intestinal damage yields astonishingly similar pathologic images.8 How enterotoxin might result in the lack of respiratory drive present in SIDS has been attributed to its effects as a “parasympathomimetic poison,” which suppresses cardiorespiratory function7,10,11, however, a definitive mechanism is yet to be identified. Clostridium perfringens is a gram-positive bacillus, an obligate anaerobe, and importantly, a pathogen to humans in addition to domesticated and wild animals.12-14 Like most Firmicutes, it is endospore forming and thus ever-present.15-18 The species is typed based on production of one or more of 4 toxins: alpha, beta, epsilon, and iota12-14, 19 -22 (see Table 1). In addition to these toxins, each “toxinotype” is also capable of carrying the gene for C. perfringens enterotoxin (CPE), which is produced during the sporulation phase of the bacterium’s life cycle. Table 1. Clostr idium perfringens toxinotypes, genotypes and associated diseases Toxinotype Toxin(s) encoded Associated diseases Humans: Gas gangrene A α Fowl: Necrotic enteritis. Foals, pigs: Diarrhea. Humans: Suspected in multiple sclerosis. B α, β, ε Newborn Lambs: Dysentery. Newborn Calves and Foals: Hemorrhagic enteritis. Sheep and Goats: Enterotoxemia. Focal symmetric encephalomalacia. Humans: Necrotic enteritis (Pigbel). C α, β Piglets, Lambs, Calves and Foals: Necrotic enteritis. Sheep: Enterotoxemia. Humans: Suspected in multiple sclerosis. D α, ε Lambs, Sheep, Calves and Goats: Enterotoxemia. Focal symmetric encephalomalacia. Calves: Enterotoxemia. E α, ι Humans: Food poisoning, sporadic diarrhea, SIDS? F α, CPE Adapted from Laetitia Petit et al. Trends in microbiology. 1999; Vol 7, Issue 3: 104-110 2 This resource was prepared by the author(s) using Federal funds provided by the U.S. Department of Justice. Opinions or points of view expressed are those of the author(s) and do not necessarily reflect the official position or policies of the U.S. Department of Justice. Alpha toxin is a chromosomally encoded phospholipase that cause cytolysis through destabilization of cell membranes.12,14, 22- 25 Beta toxin is a plasmid-encoded pore-forming toxin responsible for hemorrhagic necrosis of intestinal mucosa.12,14, 22-25 Epsilon toxin is a plasmid-encoded pore-forming toxin responsible for CNS injury in goats and sheep characterized by blood- brain-barrier permeability, and focal, symmetric white matter disease.12,14, 22-25 Iota toxin is a plasmid-encoded toxin with ADP- ribosylation activity specific for actin and resulting in cytoskeletal disruption.16,22,25 Virulence for C. perfringens-encoded toxins depends on host factors such as species, age and body habitat, as well as bacterial factors and resident microbial communities that influence gene expression. Enterotoxin is a 35 kilodalton exotoxin that is secreted during the sporulation phase of bacterium’s life cycle. It is the third leading cause of food pois oning in adults and causes a mild gastroenteritis.23,25 Interestingly, 20% of SIDS victims are reported to have suffered gastrointestinal symptoms within days leading up to sudden death. Another 66% have been found to have suffered upper respiratory infections, some of which with necrotizing features.8 The cellular receptors for enterotoxin, i.e., tight junction proteins claudin-3 and claudin-4, were discovered at the turn of the century26-29, and within recent years, other claudins have been found to bind enterotoxin but with binding affinities orders of magnitude lower than claudin-3 and claudin-4.26,29 Typical for tight junction proteins, claudin-3 and claudin-4 are commonly expressed by barrier epithelium (e.g., enterocytes that form the intestinal lumen). As depicted in the schematic below, enterotoxin binds to claudin-expressing enterocytes and forms hexameric pores in the plasma membrane. Pore formation allows for an unregulated influx of calcium into the cell, resulting in cell death.26,29 James G. Smedley III
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